74Furthermore, while it is true that Article 5(2)(a) of Regulation No 715/2007 does not formally impose any further conditions for the application of the exception laid down in that provision, the fact remains that a defeat device which, under normal driving conditions, operated during most of the year in order to protect the engine from damage or accident and ensure the safe operation of the vehicle, would clearly run counter to the objective pursued by that regulation, from which that provision allows derogation only in very specific circumstances, and would result in a disproportionate infringement of the principle of limiting NOx emissions from vehicles.
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